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首页> 外文期刊>Journal of Heat Transfer >Radiative Properties of Numerically Generated Fractal Soot Aggregates: The Importance of Configuration Averaging
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Radiative Properties of Numerically Generated Fractal Soot Aggregates: The Importance of Configuration Averaging

机译：分形碳黑聚集体的辐射特性：平均构型的重要性

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摘要

The radiative properties of numerically generated fractal soot aggregates were studied using the numerically accurate generalized multisphere Mie-solution method. The fractal aggregates investigated in this study contain 10-600 primary particles of 30 nm in diameter. These fractal aggregates were numerically generated using a combination of the particle-cluster and cluster-cluster aggregation algorithms with fractal parameters representing flame-generated soot. Ten different realizations were obtained for a given aggregate size measured by the number of primary particles. The wavelength considered is 532 nm, and the corresponding size parameter of primary particle is 0.177. Attention is paid to the effect of different realizations of a fractal aggregate with identical fractal dimension, prefactor, primary particle diameter, and the number of primary particles on its orientation-averaged radiative properties. Most properties of practical interest exhibit relatively small variation with aggregate realization. However, other scattering properties, especially the vertical-horizontal differential scattering cross section, are very sensitive to the variation in geometrical configuration of primary particles. Orientation-averaged radiative properties of a single aggregate realization are not always sufficient to represent the properties of random-oriented ensemble of fractal aggregates.
机译：使用数值精确的广义多球Mie解法研究了数值生成的分形碳黑聚集体的辐射特性。在这项研究中研究的分形聚集体包含10-600个直径为30 nm的初级粒子。这些分形聚集体是使用粒子-聚类和簇-聚类聚集算法的组合数值生成的，分形参数代表火焰生成的烟灰。对于给定的通过一次粒子数量测量的聚集体尺寸，获得了十种不同的实现。所考虑的波长为532 nm，相应的一次粒子尺寸参数为0.177。分形聚集体的不同实现方式具有相同的分形维数，因子，初级粒子直径和初级粒子数对其取向平均辐射性能的影响。实际感兴趣的大多数属性在总体实现上表现出相对较小的变化。但是，其他散射特性，尤其是垂直-水平微分散射横截面，对一次粒子的几何构型变化非常敏感。单个聚集体实现的平均方位辐射特性并不总是足以表示分形聚集体的随机取向集合体的特性。

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  • 来源
    《Journal of Heat Transfer》 |2010年第2期|023308.1-023308.6|共6页
  • 作者

    Fengshan Liu; Gregory J. Smallwood;

  • 作者单位

    Institute for Chemical Process and Environmental, Technology, National Research Council, Building M-9, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada;

    Institute for Chemical Process and Environmental, Technology, National Research Council, Building M-9, 1200 Montreal Road, Ottawa, ON, K1A 0R6, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fractal aggregates; soot; optical properties; configuration averaging;

    机译：分形聚集体煤烟;光学性质配置平均;

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